From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Dmitry Gutov Newsgroups: gmane.emacs.devel Subject: =?UTF-8?Q?Re=3a_31395511=3a_=22Don=e2=80=99t_attempt_to_modify_cons?= =?UTF-8?Q?tant_strings=22?= Date: Fri, 5 Jun 2020 20:14:12 +0300 Message-ID: References: <871rmvn7ge.fsf@gmail.com> <87lfl36abx.fsf@gmail.com> <1abe5965-b48e-6dee-1516-c5c233f09d01@cs.ucla.edu> <873679lel3.fsf@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="14461"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 Cc: Pip Cet , emacs-devel To: =?UTF-8?B?Sm/Do28gVMOhdm9yYQ==?= , Paul Eggert Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jun 05 19:14:57 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jhFvk-0003dp-LA for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Jun 2020 19:14:56 +0200 Original-Received: from localhost ([::1]:38820 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jhFvj-0002Ez-OE for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Jun 2020 13:14:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:44518) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jhFv8-0001l7-76 for emacs-devel@gnu.org; Fri, 05 Jun 2020 13:14:18 -0400 Original-Received: from mail-wr1-x433.google.com ([2a00:1450:4864:20::433]:45563) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jhFv6-0006Vw-Az for emacs-devel@gnu.org; Fri, 05 Jun 2020 13:14:17 -0400 Original-Received: by mail-wr1-x433.google.com with SMTP id c3so10495536wru.12 for ; Fri, 05 Jun 2020 10:14:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=AxIzAzPacg4MvExphyNONBlFFxmBUNDj5Hk45GXawMs=; b=abJN2Nhh9NeahA1doVihpDe15Q2r1ZBpsMoIjzHjGl5b2HBY7ZWDdWlqOAk/+EJKg4 l9gRSDlcgE8d35a1TSBgIqdQW9yAwUPDq6AuMjB4e7vQ77dcxOkhklKi8ZYZQNKJMvo9 w+DGQQ9G1kAzfcaSBB4XDmNDbL8ywkGbXjqhboNPwKzI/1neP6mpgHSZMPW0NlTkkOiB WQsqtvmS6i/cdW105jp6wFn9a1S699T5ywfG1jvWC9726xLGyn4jpBdMOUpfplYUPqkF OKPbrB+6JwWidvgY4x8f8cAdr4uUnk+eN4tzULNw4nZMQ1n4L4JT9hi6Myh392ai3pq+ 0DaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:cc:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=AxIzAzPacg4MvExphyNONBlFFxmBUNDj5Hk45GXawMs=; b=GuHzHasycGmKBGVZ3Q23Vu/B2Umh9/TRQQHBTLV5UFkML9CndD6T0RCqclKK6XeYnJ 4KJQjw19aWyEjTeCz2iHb5Bk4RV13GpJ7lANmMmTOkToW55yET1YadN3Jfiavv0p1qY/ 18b/GAGfKIeV+F02pVl8gF4FHfwtUP+emq/J/FCGN9pmWl/kyH/ugdddIiR2nfr7WzfW RdPfut3C5PFpO+e0DJI0x5kUd06rNkyG/YCLwUrwug87VtF48+jKYdEKL/c4E0mN7+wR Ub8cb8w2AuXz7WyVVRdPLXnahLlS51IxFLwX8WGtmBq76MlicQEGrHh8X8s3QbK2gZEg s5Ew== X-Gm-Message-State: AOAM531fsgLlpwgB70SsDe7cCAiWlLcvz5wdkzleS+55FhyrzEmLQkJi oM3mry5b15eBPOqGOpVSKx17cNRi X-Google-Smtp-Source: ABdhPJxJfPmpFW3szwRBLY3U5qz8zxSnCi6n86WUXDyMYev1HKE8OeWTsuWtjK3Db+lTR0mG9+fVWg== X-Received: by 2002:a5d:4a8a:: with SMTP id o10mr10491764wrq.222.1591377254361; Fri, 05 Jun 2020 10:14:14 -0700 (PDT) Original-Received: from [192.168.0.3] ([66.205.73.129]) by smtp.googlemail.com with ESMTPSA id d17sm14400570wrg.75.2020.06.05.10.14.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Jun 2020 10:14:13 -0700 (PDT) In-Reply-To: <873679lel3.fsf@gmail.com> Content-Language: en-US Received-SPF: pass client-ip=2a00:1450:4864:20::433; envelope-from=raaahh@gmail.com; helo=mail-wr1-x433.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:251913 Archived-At: On 05.06.2020 18:25, João Távora wrote: > But if you evaluate it, that doesn't happen, which is probably even > worse. > > And this is even stranger, IMO: > > (defun example-bug2 () > (eq (make-text-button > "example" nil > 'action (lambda (_) (message "action 1"))) > (make-text-button > "example" nil > 'action (lambda (_) (message "action 2"))))) > > (defun example-bug3 () > (eq "example" "example")) > > (defun example-bug4 () > (let ((str1 "example") > (str2 "example")) > (eq str1 str2))) > > (list (example-bug2) (example-bug3) (example-bug4)) > > when compiled, last form returns (t nil t) in emacs 27, > when compiled, last form returns (nil nil t) in emacs 28. > when evaluated, last form returns (nil nil nil) in emacs 28. > > For comparison, example-bug4 is valid Common Lisp and will return nil in > every Common Lisp implementation I know (I tested with ACL and SBCL), > regardless of whether compiled or evaluated. I'm reasonably confident > there's somewhere in the Hyperspec where that behaviour may be specified > (I trust some CL pope will find it for me;-) ) FWIW, it's a non-intuitive limitation for me as well. But you can give bug#40671 a read, so see some context you might be missing.